/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.jni;
/* Import needed classes */

import java.nio.ByteBuffer;

/**
 * File
 *
 * @author Mladen Turk
 */
public class File {

	/**
	 * Open the file for reading
	 */
	public static final int APR_FOPEN_READ = 0x00001;
	/**
	 * Open the file for writing
	 */
	public static final int APR_FOPEN_WRITE = 0x00002;
	/**
	 * Create the file if not there
	 */
	public static final int APR_FOPEN_CREATE = 0x00004;
	/**
	 * Append to the end of the file
	 */
	public static final int APR_FOPEN_APPEND = 0x00008;
	/**
	 * Open the file and truncate to 0 length
	 */
	public static final int APR_FOPEN_TRUNCATE = 0x00010;
	/**
	 * Open the file in binary mode
	 */
	public static final int APR_FOPEN_BINARY = 0x00020;
	/**
	 * Open should fail if APR_CREATE and file exists.
	 */
	public static final int APR_FOPEN_EXCL = 0x00040;
	/**
	 * Open the file for buffered I/O
	 */
	public static final int APR_FOPEN_BUFFERED = 0x00080;
	/**
	 * Delete the file after close
	 */
	public static final int APR_FOPEN_DELONCLOSE = 0x00100;
	/**
	 * Platform dependent tag to open the file for
	 * use across multiple threads
	 */
	public static final int APR_FOPEN_XTHREAD = 0x00200;
	/**
	 * Platform dependent support for higher level locked read/write
	 * access to support writes across process/machines
	 */
	public static final int APR_FOPEN_SHARELOCK = 0x00400;
	/**
	 * Do not register a cleanup when the file is opened
	 */
	public static final int APR_FOPEN_NOCLEANUP = 0x00800;
	/**
	 * Advisory flag that this file should support
	 * apr_socket_sendfile operation
	 */
	public static final int APR_FOPEN_SENDFILE_ENABLED = 0x01000;
	/**
	 * Platform dependent flag to enable large file support;
	 * <br><b>Warning :</b> The APR_LARGEFILE flag only has effect on some platforms
	 * where sizeof(apr_off_t) == 4.  Where implemented, it allows opening
	 * and writing to a file which exceeds the size which can be
	 * represented by apr_off_t (2 gigabytes).  When a file's size does
	 * exceed 2Gb, apr_file_info_get() will fail with an error on the
	 * descriptor, likewise apr_stat()/apr_lstat() will fail on the
	 * filename.  apr_dir_read() will fail with APR_INCOMPLETE on a
	 * directory entry for a large file depending on the particular
	 * APR_FINFO_* flags.  Generally, it is not recommended to use this
	 * flag.
	 */
	public static final int APR_FOPEN_LARGEFILE = 0x04000;

	/**
	 * Set the file position
	 */
	public static final int APR_SET = 0;
	/**
	 * Current
	 */
	public static final int APR_CUR = 1;
	/**
	 * Go to end of file
	 */
	public static final int APR_END = 2;

    /* flags for apr_file_attrs_set */

	/**
	 * File is read-only
	 */
	public static final int APR_FILE_ATTR_READONLY = 0x01;
	/**
	 * File is executable
	 */
	public static final int APR_FILE_ATTR_EXECUTABLE = 0x02;
	/**
	 * File is hidden
	 */
	public static final int APR_FILE_ATTR_HIDDEN = 0x04;


    /* File lock types/flags */

	/**
	 * Shared lock. More than one process or thread can hold a shared lock
	 * at any given time. Essentially, this is a "read lock", preventing
	 * writers from establishing an exclusive lock.
	 */
	public static final int APR_FLOCK_SHARED = 1;

	/**
	 * Exclusive lock. Only one process may hold an exclusive lock at any
	 * given time. This is analogous to a "write lock".
	 */
	public static final int APR_FLOCK_EXCLUSIVE = 2;
	/**
	 * mask to extract lock type
	 */
	public static final int APR_FLOCK_TYPEMASK = 0x000F;
	/**
	 * do not block while acquiring the file lock
	 */
	public static final int APR_FLOCK_NONBLOCK = 0x0010;

    /* apr_filetype_e values for the filetype member of the
     * apr_file_info_t structure
     * <br><b>Warning :</b>: Not all of the filetypes below can be determined.
     * For example, a given platform might not correctly report
     * a socket descriptor as APR_SOCK if that type isn't
     * well-identified on that platform.  In such cases where
     * a filetype exists but cannot be described by the recognized
     * flags below, the filetype will be APR_UNKFILE.  If the
     * filetype member is not determined, the type will be APR_NOFILE.
     */

	/**
	 * no file type determined
	 */
	public static final int APR_NOFILE = 0;
	/**
	 * a regular file
	 */
	public static final int APR_REG = 1;
	/**
	 * a directory
	 */
	public static final int APR_DIR = 2;
	/**
	 * a character device
	 */
	public static final int APR_CHR = 3;
	/**
	 * a block device
	 */
	public static final int APR_BLK = 4;
	/**
	 * a FIFO / pipe
	 */
	public static final int APR_PIPE = 5;
	/**
	 * a symbolic link
	 */
	public static final int APR_LNK = 6;
	/**
	 * a [unix domain] socket
	 */
	public static final int APR_SOCK = 7;
	/**
	 * a file of some other unknown type
	 */
	public static final int APR_UNKFILE = 127;


    /*
     * apr_file_permissions File Permissions flags
     */

	public static final int APR_FPROT_USETID = 0x8000;
	/**
	 * Set user id
	 */
	public static final int APR_FPROT_UREAD = 0x0400;
	/**
	 * Read by user
	 */
	public static final int APR_FPROT_UWRITE = 0x0200;
	/**
	 * Write by user
	 */
	public static final int APR_FPROT_UEXECUTE = 0x0100;
	/**
	 * Execute by user
	 */

	public static final int APR_FPROT_GSETID = 0x4000;
	/**
	 * Set group id
	 */
	public static final int APR_FPROT_GREAD = 0x0040;
	/**
	 * Read by group
	 */
	public static final int APR_FPROT_GWRITE = 0x0020;
	/**
	 * Write by group
	 */
	public static final int APR_FPROT_GEXECUTE = 0x0010;
	/**
	 * Execute by group
	 */

	public static final int APR_FPROT_WSTICKY = 0x2000;
	/**
	 * Sticky bit
	 */
	public static final int APR_FPROT_WREAD = 0x0004;
	/**
	 * Read by others
	 */
	public static final int APR_FPROT_WWRITE = 0x0002;
	/**
	 * Write by others
	 */
	public static final int APR_FPROT_WEXECUTE = 0x0001;
	/**
	 * Execute by others
	 */
	public static final int APR_FPROT_OS_DEFAULT = 0x0FFF;
	/**
	 * use OS's default permissions
	 */

	public static final int APR_FINFO_LINK = 0x00000001;
	/**
	 * Stat the link not the file itself if it is a link
	 */
	public static final int APR_FINFO_MTIME = 0x00000010;
	/**
	 * Modification Time
	 */
	public static final int APR_FINFO_CTIME = 0x00000020;
	/**
	 * Creation or inode-changed time
	 */
	public static final int APR_FINFO_ATIME = 0x00000040;
	/**
	 * Access Time
	 */
	public static final int APR_FINFO_SIZE = 0x00000100;
	/**
	 * Size of the file
	 */
	public static final int APR_FINFO_CSIZE = 0x00000200;
	/**
	 * Storage size consumed by the file
	 */
	public static final int APR_FINFO_DEV = 0x00001000;
	/**
	 * Device
	 */
	public static final int APR_FINFO_INODE = 0x00002000;
	/**
	 * Inode
	 */
	public static final int APR_FINFO_NLINK = 0x00004000;
	/**
	 * Number of links
	 */
	public static final int APR_FINFO_TYPE = 0x00008000;
	/**
	 * Type
	 */
	public static final int APR_FINFO_USER = 0x00010000;
	/**
	 * User
	 */
	public static final int APR_FINFO_GROUP = 0x00020000;
	/**
	 * Group
	 */
	public static final int APR_FINFO_UPROT = 0x00100000;
	/**
	 * User protection bits
	 */
	public static final int APR_FINFO_GPROT = 0x00200000;
	/**
	 * Group protection bits
	 */
	public static final int APR_FINFO_WPROT = 0x00400000;
	/**
	 * World protection bits
	 */
	public static final int APR_FINFO_ICASE = 0x01000000;
	/**
	 * if dev is case insensitive
	 */
	public static final int APR_FINFO_NAME = 0x02000000;
	/**
	 * -&gt;name in proper case
	 */

	public static final int APR_FINFO_MIN = 0x00008170;
	/**
	 * type, mtime, ctime, atime, size
	 */
	public static final int APR_FINFO_IDENT = 0x00003000;
	/**
	 * dev and inode
	 */
	public static final int APR_FINFO_OWNER = 0x00030000;
	/**
	 * user and group
	 */
	public static final int APR_FINFO_PROT = 0x00700000;
	/**
	 * all protections
	 */
	public static final int APR_FINFO_NORM = 0x0073b170;
	/**
	 * an atomic unix apr_stat()
	 */
	public static final int APR_FINFO_DIRENT = 0x02000000; /**  an atomic unix apr_dir_read() */

	/**
	 * Open the specified file.
	 *
	 * @param fname The full path to the file (using / on all systems)
	 * @param flag  Or'ed value of:
	 *              <PRE>
	 *              APR_FOPEN_READ              open for reading
	 *              APR_FOPEN_WRITE             open for writing
	 *              APR_FOPEN_CREATE            create the file if not there
	 *              APR_FOPEN_APPEND            file ptr is set to end prior to all writes
	 *              APR_FOPEN_TRUNCATE          set length to zero if file exists
	 *              APR_FOPEN_BINARY            not a text file (This flag is ignored on
	 *              UNIX because it has no meaning)
	 *              APR_FOPEN_BUFFERED          buffer the data.  Default is non-buffered
	 *              APR_FOPEN_EXCL              return error if APR_CREATE and file exists
	 *              APR_FOPEN_DELONCLOSE        delete the file after closing.
	 *              APR_FOPEN_XTHREAD           Platform dependent tag to open the file
	 *              for use across multiple threads
	 *              APR_FOPEN_SHARELOCK         Platform dependent support for higher
	 *              level locked read/write access to support
	 *              writes across process/machines
	 *              APR_FOPEN_NOCLEANUP         Do not register a cleanup with the pool
	 *              passed in on the <EM>pool</EM> argument (see below).
	 *              The apr_os_file_t handle in apr_file_t will not
	 *              be closed when the pool is destroyed.
	 *              APR_FOPEN_SENDFILE_ENABLED  Open with appropriate platform semantics
	 *              for sendfile operations.  Advisory only,
	 *              apr_socket_sendfile does not check this flag.
	 *              </PRE>
	 * @param perm  Access permissions for file.
	 * @param pool  The pool to use.
	 *              If perm is APR_OS_DEFAULT and the file is being created,
	 *              appropriate default permissions will be used.
	 * @return The opened file descriptor.
	 */
	public static native long open(String fname, int flag, int perm, long pool)
			throws Error;

	/**
	 * Close the specified file.
	 *
	 * @param file The file descriptor to close.
	 */
	public static native int close(long file);

	/**
	 * Flush the file's buffer.
	 *
	 * @param thefile The file descriptor to flush
	 */
	public static native int flush(long thefile);

	/**
	 * Open a temporary file
	 *
	 * @param templ The template to use when creating a temp file.
	 * @param flags The flags to open the file with. If this is zero,
	 *              the file is opened with
	 *              APR_CREATE | APR_READ | APR_WRITE | APR_EXCL | APR_DELONCLOSE
	 * @param pool  The pool to allocate the file out of.
	 * @return The apr file to use as a temporary file.
	 * <p>
	 * This function  generates  a unique temporary file name from template.
	 * The last six characters of template must be XXXXXX and these are replaced
	 * with a string that makes the filename unique. Since it will  be  modified,
	 * template must not be a string constant, but should be declared as a character
	 * array.
	 */
	public static native long mktemp(String templ, int flags, long pool)
			throws Error;

	/**
	 * Delete the specified file.
	 *
	 * @param path The full path to the file (using / on all systems)
	 * @param pool The pool to use.
	 *             If the file is open, it won't be removed until all
	 *             instances are closed.
	 */
	public static native int remove(String path, long pool);

	/**
	 * Rename the specified file.
	 * <br><b>Warning :</b> If a file exists at the new location, then it will be
	 * overwritten.  Moving files or directories across devices may not be
	 * possible.
	 *
	 * @param fromPath The full path to the original file (using / on all systems)
	 * @param toPath   The full path to the new file (using / on all systems)
	 * @param pool     The pool to use.
	 */
	public static native int rename(String fromPath, String toPath, long pool);

	/**
	 * Copy the specified file to another file.
	 * The new file does not need to exist, it will be created if required.
	 * <br><b>Warning :</b> If the new file already exists, its contents will be overwritten.
	 *
	 * @param fromPath The full path to the original file (using / on all systems)
	 * @param toPath   The full path to the new file (using / on all systems)
	 * @param perms    Access permissions for the new file if it is created.
	 *                 In place of the usual or'd combination of file permissions, the
	 *                 value APR_FILE_SOURCE_PERMS may be given, in which case the source
	 *                 file's permissions are copied.
	 * @param pool     The pool to use.
	 */
	public static native int copy(String fromPath, String toPath, int perms, long pool);

	/**
	 * Append the specified file to another file.
	 * The new file does not need to exist, it will be created if required.
	 *
	 * @param fromPath The full path to the source file (use / on all systems)
	 * @param toPath   The full path to the destination file (use / on all systems)
	 * @param perms    Access permissions for the destination file if it is created.
	 *                 In place of the usual or'd combination of file permissions, the
	 *                 value APR_FILE_SOURCE_PERMS may be given, in which case the source
	 *                 file's permissions are copied.
	 * @param pool     The pool to use.
	 */
	public static native int append(String fromPath, String toPath, int perms, long pool);

	/**
	 * Write the string into the specified file.
	 *
	 * @param str     The string to write. Must be NUL terminated!
	 * @param thefile The file descriptor to write to
	 */
	public static native int puts(byte[] str, long thefile);

	/**
	 * Move the read/write file offset to a specified byte within a file.
	 *
	 * @param thefile The file descriptor
	 * @param where   How to move the pointer, one of:
	 *                <PRE>
	 *                APR_SET  --  set the offset to offset
	 *                APR_CUR  --  add the offset to the current position
	 *                APR_END  --  add the offset to the current file size
	 *                </PRE>
	 * @param offset  The offset to move the pointer to.
	 * @return Offset the pointer was actually moved to.
	 */
	public static native long seek(long thefile, int where, long offset)
			throws Error;

	/**
	 * Write a character into the specified file.
	 *
	 * @param ch      The character to write.
	 * @param thefile The file descriptor to write to
	 */
	public static native int putc(byte ch, long thefile);

	/**
	 * Put a character back onto a specified stream.
	 *
	 * @param ch      The character to write.
	 * @param thefile The file descriptor to write to
	 */
	public static native int ungetc(byte ch, long thefile);

	/**
	 * Write data to the specified file.
	 * <p>
	 * Write will write up to the specified number of
	 * bytes, but never more.  If the OS cannot write that many bytes, it
	 * will write as many as it can.  The third argument is modified to
	 * reflect the * number of bytes written.
	 * <p>
	 * It is possible for both bytes to be written and an error to
	 * be returned.  APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to write to.
	 * @param buf     The buffer which contains the data.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to write; (-1) for full array.
	 * @return The number of bytes written.
	 */
	public static native int write(long thefile, byte[] buf, int offset, int nbytes);

	/**
	 * Write data to the specified file.
	 * <p>
	 * Write will write up to the specified number of
	 * bytes, but never more.  If the OS cannot write that many bytes, it
	 * will write as many as it can.  The third argument is modified to
	 * reflect the * number of bytes written.
	 * <p>
	 * It is possible for both bytes to be written and an error to
	 * be returned.  APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to write to.
	 * @param buf     The direct Byte buffer which contains the data.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to write
	 * @return The number of bytes written.
	 */
	public static native int writeb(long thefile, ByteBuffer buf, int offset, int nbytes);

	/**
	 * Write data to the specified file, ensuring that all of the data is
	 * written before returning.
	 * <p>
	 * Write will write up to the specified number of
	 * bytes, but never more.  If the OS cannot write that many bytes, the
	 * process/thread will block until they can be written. Exceptional
	 * error such as "out of space" or "pipe closed" will terminate with
	 * an error.
	 * <p>
	 * It is possible for both bytes to be written and an error to
	 * be returned.  And if *bytes_written is less than nbytes, an
	 * accompanying error is _always_ returned.
	 * <p>
	 * APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to write to.
	 * @param buf     The buffer which contains the data.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to write; (-1) for full array.
	 * @return The number of bytes written.
	 */
	public static native int writeFull(long thefile, byte[] buf, int offset, int nbytes);

	/**
	 * Write data to the specified file, ensuring that all of the data is
	 * written before returning.
	 * <p>
	 * Write will write up to the specified number of
	 * bytes, but never more.  If the OS cannot write that many bytes, the
	 * process/thread will block until they can be written. Exceptional
	 * error such as "out of space" or "pipe closed" will terminate with
	 * an error.
	 * <p>
	 * It is possible for both bytes to be written and an error to
	 * be returned.  And if *bytes_written is less than nbytes, an
	 * accompanying error is _always_ returned.
	 * <p>
	 * APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to write to.
	 * @param buf     The direct ByteBuffer which contains the data.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to write.
	 * @return The number of bytes written.
	 */
	public static native int writeFullb(long thefile, ByteBuffer buf, int offset, int nbytes);

	/**
	 * Write data from array of byte arrays to the specified file.
	 * <p>
	 * It is possible for both bytes to be written and an error to
	 * be returned.  APR_EINTR is never returned.
	 * <p>
	 * apr_file_writev is available even if the underlying
	 * operating system doesn't provide writev().
	 *
	 * @param thefile The file descriptor to write to.
	 * @param vec     The array from which to get the data to write to the file.
	 * @return The number of bytes written.
	 */
	public static native int writev(long thefile, byte[][] vec);

	/**
	 * Write data from array of byte arrays to the specified file,
	 * ensuring that all of the data is written before returning.
	 * <p>
	 * writevFull is available even if the underlying
	 * operating system doesn't provide writev().
	 *
	 * @param thefile The file descriptor to write to.
	 * @param vec     The array from which to get the data to write to the file.
	 * @return The number of bytes written.
	 */
	public static native int writevFull(long thefile, byte[][] vec);

	/**
	 * Read data from the specified file.
	 * <p>
	 * apr_file_read will read up to the specified number of
	 * bytes, but never more.  If there isn't enough data to fill that
	 * number of bytes, all of the available data is read.  The third
	 * argument is modified to reflect the number of bytes read.  If a
	 * char was put back into the stream via ungetc, it will be the first
	 * character returned.
	 * <p>
	 * It is not possible for both bytes to be read and an APR_EOF
	 * or other error to be returned.  APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to read from.
	 * @param buf     The buffer to store the data to.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to read (-1) for full array.
	 * @return the number of bytes read.
	 */
	public static native int read(long thefile, byte[] buf, int offset, int nbytes);

	/**
	 * Read data from the specified file.
	 * <p>
	 * apr_file_read will read up to the specified number of
	 * bytes, but never more.  If there isn't enough data to fill that
	 * number of bytes, all of the available data is read.  The third
	 * argument is modified to reflect the number of bytes read.  If a
	 * char was put back into the stream via ungetc, it will be the first
	 * character returned.
	 * <p>
	 * It is not possible for both bytes to be read and an APR_EOF
	 * or other error to be returned.  APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to read from.
	 * @param buf     The direct Byte buffer to store the data to.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to read.
	 * @return the number of bytes read.
	 */
	public static native int readb(long thefile, ByteBuffer buf, int offset, int nbytes);

	/**
	 * Read data from the specified file, ensuring that the buffer is filled
	 * before returning.
	 * <p>
	 * Read will read up to the specified number of
	 * bytes, but never more.  If there isn't enough data to fill that
	 * number of bytes, then the process/thread will block until it is
	 * available or EOF is reached.  If a char was put back into the
	 * stream via ungetc, it will be the first character returned.
	 * <p>
	 * It is possible for both bytes to be read and an error to be
	 * returned.  And if *bytes_read is less than nbytes, an accompanying
	 * error is _always_ returned.
	 * <p>
	 * APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to read from.
	 * @param buf     The buffer to store the data to.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to read (-1) for full array.
	 * @return the number of bytes read.
	 */
	public static native int readFull(long thefile, byte[] buf, int offset, int nbytes);

	/**
	 * Read data from the specified file, ensuring that the buffer is filled
	 * before returning.
	 * <p>
	 * Read will read up to the specified number of
	 * bytes, but never more.  If there isn't enough data to fill that
	 * number of bytes, then the process/thread will block until it is
	 * available or EOF is reached.  If a char was put back into the
	 * stream via ungetc, it will be the first character returned.
	 * <p>
	 * It is possible for both bytes to be read and an error to be
	 * returned.  And if *bytes_read is less than nbytes, an accompanying
	 * error is _always_ returned.
	 * <p>
	 * APR_EINTR is never returned.
	 *
	 * @param thefile The file descriptor to read from.
	 * @param buf     The direct ByteBuffer to store the data to.
	 * @param offset  Start offset in buf
	 * @param nbytes  The number of bytes to read.
	 * @return the number of bytes read.
	 */
	public static native int readFullb(long thefile, ByteBuffer buf, int offset, int nbytes);

	/**
	 * Read a string from the specified file.
	 * The buffer will be NUL-terminated if any characters are stored.
	 *
	 * @param buf     The buffer to store the string in.
	 * @param offset  Start offset in buf
	 * @param thefile The file descriptor to read from
	 */
	public static native int gets(byte[] buf, int offset, long thefile);

	/**
	 * Read a character from the specified file.
	 *
	 * @param thefile The file descriptor to read from
	 * @return The read character
	 */
	public static native int getc(long thefile)
			throws Error;

	/**
	 * Are we at the end of the file
	 *
	 * @param fptr The apr file we are testing.
	 * @return Returns APR_EOF if we are at the end of file, APR_SUCCESS otherwise.
	 */
	public static native int eof(long fptr);

	/**
	 * return the file name of the current file.
	 *
	 * @param thefile The currently open file.
	 */
	public static native String nameGet(long thefile);

	/**
	 * Set the specified file's permission bits.
	 * <br><b>Warning :</b> Some platforms may not be able to apply all of the
	 * available permission bits; APR_INCOMPLETE will be returned if some
	 * permissions are specified which could not be set.
	 * <br><b>Warning :</b> Platforms which do not implement this feature will return
	 * APR_ENOTIMPL.
	 *
	 * @param fname The file (name) to apply the permissions to.
	 * @param perms The permission bits to apply to the file.
	 */
	public static native int permsSet(String fname, int perms);

	/**
	 * Set attributes of the specified file.
	 * This function should be used in preference to explicit manipulation
	 * of the file permissions, because the operations to provide these
	 * attributes are platform specific and may involve more than simply
	 * setting permission bits.
	 * <br><b>Warning :</b> Platforms which do not implement this feature will return
	 * APR_ENOTIMPL.
	 *
	 * @param fname      The full path to the file (using / on all systems)
	 * @param attributes Or'd combination of
	 *                   <PRE>
	 *                   APR_FILE_ATTR_READONLY   - make the file readonly
	 *                   APR_FILE_ATTR_EXECUTABLE - make the file executable
	 *                   APR_FILE_ATTR_HIDDEN     - make the file hidden
	 *                   </PRE>
	 * @param mask       Mask of valid bits in attributes.
	 * @param pool       the pool to use.
	 */
	public static native int attrsSet(String fname, int attributes, int mask, long pool);

	/**
	 * Set the mtime of the specified file.
	 * <br><b>Warning :</b> Platforms which do not implement this feature will return
	 * APR_ENOTIMPL.
	 *
	 * @param fname The full path to the file (using / on all systems)
	 * @param mtime The mtime to apply to the file in microseconds
	 * @param pool  The pool to use.
	 */
	public static native int mtimeSet(String fname, long mtime, long pool);

	/**
	 * Establish a lock on the specified, open file. The lock may be advisory
	 * or mandatory, at the discretion of the platform. The lock applies to
	 * the file as a whole, rather than a specific range. Locks are established
	 * on a per-thread/process basis; a second lock by the same thread will not
	 * block.
	 *
	 * @param thefile The file to lock.
	 * @param type    The type of lock to establish on the file.
	 */
	public static native int lock(long thefile, int type);

	/**
	 * Remove any outstanding locks on the file.
	 *
	 * @param thefile The file to unlock.
	 */
	public static native int unlock(long thefile);

	/**
	 * Retrieve the flags that were passed into apr_file_open()
	 * when the file was opened.
	 *
	 * @param file The file to retrieve flags.
	 * @return the flags
	 */
	public static native int flagsGet(long file);

	/**
	 * Truncate the file's length to the specified offset
	 *
	 * @param fp     The file to truncate
	 * @param offset The offset to truncate to.
	 */
	public static native int trunc(long fp, long offset);

	/**
	 * Create an anonymous pipe.
	 *
	 * @param io   io[0] The file descriptors to use as input to the pipe.
	 *             io[1] The file descriptor to use as output from the pipe.
	 * @param pool The pool to operate on.
	 */
	public static native int pipeCreate(long[] io, long pool);

	/**
	 * Get the timeout value for a pipe or manipulate the blocking state.
	 *
	 * @param thepipe The pipe we are getting a timeout for.
	 * @return The current timeout value in microseconds.
	 */
	public static native long pipeTimeoutGet(long thepipe)
			throws Error;

	/**
	 * Set the timeout value for a pipe or manipulate the blocking state.
	 *
	 * @param thepipe The pipe we are setting a timeout on.
	 * @param timeout The timeout value in microseconds.  Values &lt; 0 mean
	 *                wait forever, 0 means do not wait at all.
	 */
	public static native int pipeTimeoutSet(long thepipe, long timeout);

	/**
	 * Duplicate the specified file descriptor.
	 *
	 * @param newFile The file to duplicate.
	 *                newFile must point to a valid apr_file_t, or point to NULL.
	 * @param oldFile The file to duplicate.
	 * @param pool    The pool to use for the new file.
	 * @return Duplicated file structure.
	 */
	public static native long dup(long newFile, long oldFile, long pool)
			throws Error;

	/**
	 * Duplicate the specified file descriptor and close the original.
	 *
	 * @param newFile The old file that is to be closed and reused.
	 *                newFile MUST point at a valid apr_file_t. It cannot be NULL.
	 * @param oldFile The file to duplicate.
	 * @param pool    The pool to use for the new file.
	 * @return Status code.
	 */
	public static native int dup2(long newFile, long oldFile, long pool);

	/**
	 * Get the specified file's stats.  The file is specified by filename,
	 * instead of using a pre-opened file.
	 *
	 * @param finfo  Where to store the information about the file, which is
	 *               never touched if the call fails.
	 * @param fname  The name of the file to stat.
	 * @param wanted The desired apr_finfo_t fields, as a bit flag of APR_FINFO_ values
	 * @param pool   the pool to use to allocate the new file.
	 */
	public static native int stat(FileInfo finfo, String fname, int wanted, long pool);

	/**
	 * Get the specified file's stats.  The file is specified by filename,
	 * instead of using a pre-opened file.
	 *
	 * @param fname  The name of the file to stat.
	 * @param wanted The desired apr_finfo_t fields, as a bit flag of APR_FINFO_ values
	 * @param pool   the pool to use to allocate the new file.
	 * @return FileInfo object.
	 */
	public static native FileInfo getStat(String fname, int wanted, long pool);

	/**
	 * Get the specified file's stats.
	 *
	 * @param finfo   Where to store the information about the file.
	 * @param wanted  The desired apr_finfo_t fields, as a bit flag of APR_FINFO_ values
	 * @param thefile The file to get information about.
	 */
	public static native int infoGet(FileInfo finfo, int wanted, long thefile);

	/**
	 * Get the specified file's stats.
	 *
	 * @param wanted  The desired apr_finfo_t fields, as a bit flag of APR_FINFO_ values
	 * @param thefile The file to get information about.
	 * @return FileInfo object.
	 */
	public static native FileInfo getInfo(int wanted, long thefile);

}
